I play the guitar and find some people I can play with.

the way how you feel Example: sad, mad, glad

In grammar, inflection or inflexion is the modification of a word to express different grammatical categories such as tense, grammatical mood, grammatical voice,aspect, person, number, gender and case. Conjugation is the inflection of verbs; declension is the inflection of nouns, adjectives and pronouns. according to wikipedia so inflection would be the answer to the question

Inflectional affixes are morphemes added to the base form of a word to indicate grammatical information such as tense, aspect, mood, number, case, and gender. They do not change the core meaning of the word but modify its grammatical function within a sentence.

The verb should be in the subjunctive mood: "If I were you." However, use of the subjunctive is waning fast, and even careful speakers will occasionally get this wrong.